A compact dual band cross dipole antenna surrounded with metallic plates at five sides has been proposed in this article. comparative analysis has been done between the dipole and cross dipole antenna. On comparing these two antennas the proposed antenna has the high gain of 7db and radiation efficiency of 95 percent. The peak directivity of the proposed antenna is 5DB and its front to back ration is 60. The return loss, gain, radiation patterns and co polarization and cross polarization of the antenna has been observed and analysed using AN-soft HFSS v13.The proposed antenna works at the range of 0.6GHz to 1.5GHz which covers the applications like GSM, GNSS and some of the applications which covers in the range of UHF and VHF.

<p>Antennas are long used for communication of data since a century and their usage has been diversified over the past two decades and the antennas also entered the domain of medical fields. A rectangular microstrip patch antenna has been designed on a substrate integrated waveguide with frequency selective surface which is in the shape of a square. The design of this antenna with SIW are done by using CST on a low cost FR4 substrate where є_r =4.4, h=1.58 mm and tan δ=0.0035. The SIW structure merit is utilized on the traditional FSS is simulated and verified by using CST.</p>

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<abstract> <p>A dual-band google lens logo-based patch antenna with defected ground structure was designed at 5.3 GHz for wireless applications and 7.4 GHz for wi-fi application. The designed antenna consists of a rounded rectangular patch antenna with a partial ground structure fed by a 50 Ω microstrip line. A google lens shaped logo is subtracted from the rounded rectangular patch and some regular polygon shaped slots are subtracted from the ground plane to obtain good dual-band characteristics and better results in terms of gain, VSWR, and return loss. The proposed antenna has a measurement of 20 × 20 × 1.6 mm³ and provides wide impedance bandwidths of 0.23 GHz (5.17‒5.40 GHz) and 0.16 GHz (7.33–7.49 GHz) at center frequencies of 5.3 GHz and 7.4 GHz, respectively. The antenna was designed and simulated using an ANSYS Electronics Desktop. Fabrication of the antenna was obtained using chemical etching and the results were measured by using an MS2037C Anritsu combinational analyzer. The return loss characteristics for dual bands are -20.56 dB at 5.3 GHz and -19.17 dB at 7.4 GHz, respectively, with a VSWR &lt; 2 at both the frequencies and a 4 dB gain is obtained.</p> </abstract>

<abstract> <p>The proposed reconfigurable BPF satisfies the International Telecommunication Unionos (ITU) region 3 spectrum requirement. In transmit mode, the frequency range 11.41-12.92 GHz is used by the direct broadcast service (DBS) and the fixed satellite service (FSS). Direct broadcast service (DBS) in reception mode employs 11.7-12.2 GHz and 17.3-17.8 GHz frequency ranges. Frequency reconfigurable filters are popular because they can cover wide range of frequencies, reducing system cost and space. Another emerging trend is electronic component flexibility or conformability, which allows them to be mounted on non-planar objects and are used in wearable applications. This project contains a frequency-reconfigurable BPF that has been entirely printed on a flexible polimide substrate. Frequency reconfigurability is obtained by using a pin diode HSCH 5318 and it is used to switch between 12 GHz and 18 GHz. The prototype reconfigurable BPF is highly compact and low-cost due to the flexible polimide substrate and the measured results are promising and match the simulated results well.</p> </abstract>